Base friction test on unloading deformation mechanism of soft foundation waste dump under gravity

Wang, Yukai; Sun, Shuwei; Pang, Bo; Liu, Liu

doi:10.1016/j.measurement.2020.108054

Cited by 18 publications

(6 citation statements)

References 22 publications

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“…, where f is the friction coefficient between the model and moving belt,  is the unit weight of the model material (N/m 3 ), and t is the thickness of the model material (m) (Wang et al, 2020). According to Saint-Venant's principle, the frictional stress can simulate gravitational stress with the model if the model is sufficiently thin (Wang et al, 2020;Bray and Goodman, 1981). Hence, the failure of the model caused by the belt rotation can be equivalent to the failure of the prototype under gravity.…”

Section: Principle Of Base Friction and Devicesmentioning

confidence: 99%

Failure of Rock Slopes With Intermittent Joints: Failure Process and Stability Calculation Models

Zhou

Shen

Chen

2021

Preprint

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Rock slopes with intermittent joints in open-pit mines are complex geological bodies composed of intact rock and discontinuous structural planes, and their stability analysis are necessary for mine disaster prevention. In this study, a series of base friction tests were performed to determine the failure process and displacement field evolution of rock slopes with intermittent joints using the speckle technique of a noncontact measurement system. Next, stability calculation models of the slopes were established from the energy perspective using the plastic limit analysis theory, and the effects of the joint inclination angle and coalescence coefficient of rock bridges on the slope stability were evaluated. The four main conclusions are as follows. (1) The failure of rock slopes with intermittent joints shows the feature of collapse-lower traction-upper push. (2) Based on the failure modes of rock bridges in slopes, the failure of rock slopes with intermittent joints could be divided into three types: tensile coalescence (Type A), shear coalescence (Type B), and tensile–shear coalescence (Type C). (3) Among the three slope types, the stability of the Type A slope is significantly influenced by rock cohesion, whereas that the Type B slope is significantly influenced by joint cohesion. The stability of the Type C slope is significantly influenced by the joint inclination angle and joint friction angle. (4) The local-stable slope is unstable while the first through-tensile crack in the zone of the potential sliding body higher than the critical instability height appeared. This study guides the stability evaluation and instability prediction of jointed rock slopes in open-pit mines.

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Section: Principle Of Base Friction and Devicesmentioning

confidence: 99%

Failure of Rock Slopes With Intermittent Joints: Failure Process and Stability Calculation Models

Zhou

Shen

Chen

2021

Preprint

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“…Researchers have proposed a series of control methods, e.g., reducing batter angle [5], backfilling rocks to squeeze out ooze [6,7], floor disruption [8,9], coal pillar buttressing [10], drainage [11,12], floor grouting [13,14], chemical treatment [15][16][17], and slope consolidation grouting [18]. Reducing slope angle will improve slope stability.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of a Floor Treatment Plan for In-Pit Dumps with an Underlying Weak Layer

et al. 2023

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To effectively manage the stability of in-pit dumps with an underlying weak layer, a new plan for the treatment of a staged floor during the life of a mine was proposed in this study. Based on direct shear test results, the shear properties of contact surfaces between the weak layer, dumped spoil, and mudstone were determined. Taking the Baiyinhua No.1 Open-pit Mine as an example, a direct shear test of the contact surface between the spoil and the mudstone determined its cohesion to be 25.78 kPa, and the internal friction angle was 17.58°. The cohesion of the contact surface between the spoil and the weak layer was 7.50 kPa, and the internal friction angle was 9.72°. Different floor treatment rates were subsequently determined based on discontinuous structural surface and limit equilibrium theories. The in-pit dump plan was divided into stages based on a 10-year mine plan; a “safety reserve coefficient” was used as the conditional factor to calculate the minimum floor treatment rate. The results of a numerical simulation analysis of the slope stability of the untreated and treated inner dumps showed good agreement with results obtained by the limit equilibrium method. The position and shape of the sliding surface were also found to be similar, indicating the validity of the established numerical simulation model and the reliability of the calculated results. Based on field application and economic effect analysis, it was found that this proposed method can minimize the floor treatment rate effectively while maintaining a sufficient factor of safety. The direct economic benefit of this method was approximately 1,694,259 dollars at the Baiyinhua No.1 Coal Mine. This method is of great significance to safe and efficient production, and can be widely applied.

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“…This method is supported by the mathematical principle developed by Bray and Goodman [19]. Therefore, determined by the advantages of low cost, ease of control, and solid theory, it has become one of the most commonly used methods for gravity simulation in the laboratory [20,21]. Combining a noncontact measurement system with its advantages of quick and undisturbed operation [22], the deformation-failure process associated with displacement/strain field evolution [23] can be validly analyzed by measured point tracking [24] for rocky slopes with locking sections [25].…”

Section: Introductionmentioning

confidence: 99%

Insight into the Evolutionary Mechanism of the Rear Fissure of Landslides That Conform to the Three-Section Mechanism

Tang,

Chen,

Qin

2023

Sustainability

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In landslides that conform to the three-section mechanism, the rear fissure is the essential component of the potential sliding surface. Hence, the evolutionary mechanism behind that is important for reducing the risk of such landslides. In this research, the evolutionary features and processes were analyzed through a case of landslides that conform to the three-section mechanism; then, base friction testing was carried out to explore the evolutionary mechanism of the rear fissure. On the reliability–validation basis of the consistency of outside deformation features between the testing model and real slopes, deeper analysis of the inner deformation field linked to different rear fissure depths indicates that the weak front interlayer controls the inevitability of the rear tension fissure onset. During rear tension fissure propagation from zero to the critical depth (Hcr), the driving effect of tension fissure propagation undergoes a process of accelerating followed by decelerating roughly bounded by Hcr/2. Moreover, the rear tension fissure closure trend may start at a tension fissure depth of approximately Hcr/2 instead of starting at nearly Hcr. Because of this, the rear tension fissure closure trend that previously suggested by researchers may not always be a perfect indicator of landslides that conform to the three-section mechanism. It may result in the misprediction of such landslides. The findings of this research contribute to a better understanding of the evolutionary mechanisms underlying rear fissures, which, in turn, can help to promote disaster mitigation for landslides that conform to the three-section mechanism. This research can enhance sustainable development by improving safety for people and their property.

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Base friction test on unloading deformation mechanism of soft foundation waste dump under gravity

Cited by 18 publications

References 22 publications

Failure of Rock Slopes With Intermittent Joints: Failure Process and Stability Calculation Models

Failure of Rock Slopes With Intermittent Joints: Failure Process and Stability Calculation Models

An Investigation of a Floor Treatment Plan for In-Pit Dumps with an Underlying Weak Layer

Insight into the Evolutionary Mechanism of the Rear Fissure of Landslides That Conform to the Three-Section Mechanism

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